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Questions and Answers
What is the term for the transmission of the depolarization process along a nerve or muscle fiber?
What is the term for the transmission of the depolarization process along a nerve or muscle fiber?
- Nerve impulse (correct)
- Muscle impulse
- Action potential
- Saltatory conduction
What is the function of myelin sheath in myelinated nerve fibers?
What is the function of myelin sheath in myelinated nerve fibers?
- Generates action potential
- Increases the velocity of impulse transmission (correct)
- Causes whole fiber depolarization
- Prevents saltatory conduction
In saltatory conduction, where does the nerve impulse jump along the fiber?
In saltatory conduction, where does the nerve impulse jump along the fiber?
- Only at the myelin sheath
- From node to node (correct)
- From Schwann cell to Schwann cell
- Randomly along the fiber
What is the advantage of saltatory conduction?
What is the advantage of saltatory conduction?
What is the process called when a weak stimulus fails to reach the threshold point to produce automatic regenerative opening of the Na channels and develop an action potential?
What is the process called when a weak stimulus fails to reach the threshold point to produce automatic regenerative opening of the Na channels and develop an action potential?
What factor decreases nerve excitability by decreasing membrane permeability to sodium ions and simultaneously reducing excitability?
What factor decreases nerve excitability by decreasing membrane permeability to sodium ions and simultaneously reducing excitability?
Which process describes the automatic regenerative opening of sodium channels due to mechanical disturbance, chemical effects, or passage of electricity through the membrane?
Which process describes the automatic regenerative opening of sodium channels due to mechanical disturbance, chemical effects, or passage of electricity through the membrane?
What is the special feature of the Na+-K+ ATP pump mentioned in the text?
What is the special feature of the Na+-K+ ATP pump mentioned in the text?
What is the requirement for continued propagation of an impulse?
What is the requirement for continued propagation of an impulse?
What is the significance of the 'safety factor for propagation'?
What is the significance of the 'safety factor for propagation'?
What is responsible for re-establishing the sodium and potassium membrane concentration differences?
What is responsible for re-establishing the sodium and potassium membrane concentration differences?
How does the Na+-K+ pump contribute to recharging the nerve fiber?
How does the Na+-K+ pump contribute to recharging the nerve fiber?
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